The 44-year-old was stabbed thrice and died on the spot, police said.
A case has been registered and police are searching for the attackers. More details are awaited.
The BJP had called the deaths "political murders". BJP president Amit Shah had tweeted he was "deeply hurt by the brutal killing of our young karyakarta."
Get the latest election news, live updates and election schedule for Lok Sabha Elections 2019 on ndtv.com/elections. Like us on Facebook or follow us on Twitter and Instagram for updates from each of the 543 parliamentary seats for the 2019 Indian general elections. Election results will be out on May 23.